docs: document OrcaRouter as a gateway option for the M365 add-in

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What

For firms deploying the Claude Microsoft 365 add-in through claude-for-msft-365-install, this documents OrcaRouter as a named gateway option alongside LiteLLM, Portkey, and Kong in the /claude-for-msft-365-install:setup wizard.

OrcaRouter is an OpenAI-compatible AI gateway built for both models and agents. Like OpenRouter, it exposes a provider/model namespace across many models — but it also combines adaptive routing, automatic failover, zero-markup inference, observability, guardrails, and agent-tool governance behind the same endpoint. Adding it to the wizard's gateway guidance means firms that run OrcaRouter can point the add-in at it directly, without treating it as an anonymous custom base URL.

It also runs gateway-level, zero-trust security for AI agents on the same endpoint — screening every prompt/response and governing every tool call on a default-deny basis, with no application code changes.

Changes

• claude-for-msft-365-install/commands/setup.md — list OrcaRouter in the Step 1 "do you already run an LLM gateway?" prompt and the API-format callout, and add an "OrcaRouter" subsection to the Gateway path covering the exact manifest keys it needs.
• The OrcaRouter subsection spells out the zero-config line format: OrcaRouter serves the Anthropic /v1/messages API natively, so it needs only gateway_url=https://api.orcarouter.ai and the firm's gateway_token — gateway_api_format stays unset, matching the add-in's default.
• claude-for-msft-365-install/.claude-plugin/plugin.json — version 0.1.9 → 0.1.10 (auto-bump by the repo's pre-commit hook; a plugin's version gates update delivery to installed users).

Verification

• python3 scripts/check.py passes — 83 files checked, 0 issues.
• Live-tested OrcaRouter against the exact request shape the add-in sends (Anthropic /v1/messages, x-api-key auth, claude-*-compatible model namespace): HTTP 200.

I'm an engineer on the OrcaRouter team. Discord: discord.gg/YEubt8enRA · X: https://x.com/OrcaRouter